an exclusive jailhouse interview from a woman doing life behind bars for first robbing and killing a big lottery winner. His body was found buried. Prosecutors say she went to great lengths to cover it all up. And she claims she's innocent and told abc's matt gutman. Reporter: Dee dee moore may have been convicted of killing herman shakespeare. But according to a jailhouse interview, it's a laughing matter. Reporter: Why are you laughing? A man is dead. He's been murdered. I find it entertaining that people are that ignorant. Reporter: Moore befriended shakespeare, who despite his illustrious name, was ill literal. She told him she was help hipg manage his cash. And document his life, as she did in this video. Where do you want to go to? It doesn't matter to me. I'm not a picky person. California. Reporter: But prosecutors say moore striked shakespeare, taking his money before taking his life. I'm innocent. Every person knows I'm innocent. Reporter: But one thing did her in, her mouth. Greg smith, a friend of shakespeare's agreed to help moore cover up her tracks. Instead, he was covering up their conversations for police. I had to go -- I told them I'd see what I could do. Reporter: In her first interview behind bars, moore moves from temper -- to tears. I like -- Reporter: And she's saying she's innocent, despite leading police to shakespeare's body. She claims there are witnesses who support her version. A mysterious drug dealer killed shakespeare. These are witness statements. You understand? Reporter: The witnesses don't exist. And that looks like your handwriting. What do you mean -- Reporter: That lks like your handwriting. It looks like your handwriting. Reporter: As she exited stage left, she threw out a name. Her first name is deanna. We asked police about about deanna. They said, like much of dee dee moore's story, it's fiction. All right. Be sure to watch a special edition of "20/20," crazy stupid luck. It airs tonight at 10:00 eastern on abc.

This transcript has been automatically generated and may not be 100% accurate.

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